Sharayk bin 'Abdullah شريك بن عبد الله النخعي · The Book of Fasting

"Should a menstruating woman make up the prayers when she becomes pure?" she said: "Are youa Haruri? We used to menstruate at the time of the Messenger of Allah then we would become pure. He told us to make up the fast, but he did not tell us to make up the prayers."

" I heard the Messenger of Allah say: 'The month of patience ( Ramadan) and three days of each month is fasting for a lifetime."' (Sahih).

"The Messenger of Allah said: 'Whoever fasts for three days of each month, he has fasted for a whole lifetime.' Then he said: Allah has spoken the truth in His book: Whoever brings a good deed shall have ten times the like thereof to his credit.